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Surface sizing agent emulsion and preparation method for same

A technology of surface sizing agent and emulsion, applied in the direction of adding water repellent, inorganic compound, non-polymer organic compound, etc., can solve the problem of large amount of sizing agent, and achieve the effect of improving hydrophobicity

Inactive Publication Date: 2013-11-27
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN200710150369.0 discloses a method for obtaining a sizing agent emulsion by using a cationic polymer emulsified sizing agent graft-polymerized with a natural polymer. larger

Method used

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  • Surface sizing agent emulsion and preparation method for same

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Embodiment 1

[0037] Synthesis of cationic polymers:

[0038] a) 0.3g potassium persulfate is dissolved in 10g deionized water to be dissolved into initiator aqueous solution, for subsequent use;

[0039] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 60°C;

[0040] c) At 60°C, add 1g of hydrogen peroxide into a four-necked flask, and keep warm at 60°C for 1 hour; use 3g of sodium hydroxide to adjust the pH to 10.2.

[0041] d) Then raise the temperature to 70°C, quickly add 10g of 3-chloro-2-hydroxypropyltrimethylammonium chloride into the four-neck flask, keep it at 70°C for 2 hours; use 1g of acetic acid to neutralize to pH=3.05, then drop Add 0.5g of vinyltriisopropoxysilane and initiator solution, add dropwise for 5 minutes, keep warm at 70°C for 0.5 hours, add 0.5g sodium methylene bis-naphthalene sulfonate, keep warm at 70°C for 0.5 hours, add 30.9g Deionized water was cooled to 25°C and filtered to obtain a cationic poly...

Embodiment 2

[0047] Synthesis of cationic polymers:

[0048] a) 3g of sodium persulfate is dissolved in 10g of deionized water to form an aqueous initiator solution. spare;

[0049] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 70°C;

[0050] c) At 70°C, add 5g of hydrogen peroxide into a four-necked flask, and keep warm at 70°C for 3 hours; use 10g of sodium hydroxide to adjust the pH to 12.93.

[0051] d) Then heat up to 90°C, quickly add 30g of 2,3-epoxypropyltrimethylammonium chloride into the four-neck flask, keep it at 90°C for 5 hours; neutralize with 3g of acetic acid to pH=4.85, then add dropwise 5g of γ-methacryloyloxypropyltrimethoxysilane and initiator solution, dropwise for 15 minutes, 90 ° C for 1 hour, add 1 g of sodium methylene bis-methyl naphthalene sulfonate, 90 ° C for 1 hour, Add 278g of deionized water, cool down to 25°C and filter to obtain a cationic polymer: the weight solid content is 20.4wt%, and th...

Embodiment 3

[0057] Synthesis of cationic polymers:

[0058] a) 2g of ammonium persulfate is dissolved in 10g of deionized water to form an aqueous initiator solution. spare;

[0059] b) Add 100g of chitosan and 300g of deionized water into a 1000ml four-neck flask, dissolve, and heat up to 65°C;

[0060] c) At 65°C, add 3g of hydrogen peroxide into a four-necked flask, and keep warm at 65°C for 2 hours; use 6g of sodium hydroxide to adjust the pH to 11.60.

[0061] d) Heat up to 80°C again, quickly add 20g of 3-chloro-2-hydroxypropyltrimethylammonium chloride into the four-neck flask, keep it at 80°C for 3 hours; neutralize with 2g of acetic acid to pH=4.08, then drop Add 3g of vinyl triethoxysilane and initiator solution, add dropwise for 10 minutes, keep warm at 80°C for 0.8 hours, add 0.7g sodium methylene bis-naphthalene sulfonate, keep warm at 80°C for 0.8 hours, add 138.5g to Ionized water was cooled to 25°C and filtered to obtain a cationic polymer: the weight solid content was ...

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Abstract

The invention provides a preparation method for a surface sizing agent emulsion. The preparation method comprises the following steps: mixing a cationic polymer with water; adding molten AKD (alkyl ketene dimer) wax and paraffin wax at 70-75 DEG C; and then homogenizing in a condition of 10-25 Mpa, cooling to a temperature below 40 DEG C, and adding glyoxal, so as to obtain the surface sizing agent emulsion, wherein the cationic polymer is prepared by reacting a cationic etherifying agent, chitosan, hydrogen peroxide, silane, acetic acid, sodium hydroxide and a dispersing agent under the action of an initiator; the surface sizing agent emulsion comprises the following components in parts by weight: 80-90 parts of the AKD wax, 10-20 parts of the paraffin wax, 25-100 parts of the cationic polymer, 1-5 parts of glyoxal, and 270-600 parts of water, wherein the total of the AKD wax and the paraffin wax is 100 parts by weight. The surface sizing agent emulsion provided by the invention is a high-performance and environment-friendly product capable of meeting application for papermaking coatings; the product is capable of obviously improving the hydrophobicity of paper, reducing the Cobb value, and improving the surface strength of the paper in case of being applied to surface sizing for the paper.

Description

technical field [0001] The invention relates to a surface sizing agent emulsion, which is used for surface sizing in the paper production process. Background technique [0002] With the development of medium-alkaline papermaking technology, as a reactive medium-alkaline sizing agent, it has the characteristics of high sizing efficiency and low dosage, and has been widely used in papermaking. Traditional sizing agent emulsion uses cationic starch as emulsifier and stabilizer, but the retention rate of this emulsion on fiber is low, the reaction with fiber is slow, and the sizing curing time is long. In recent years, with the use of coated broken paper, deinked waste paper, and high-yield pulp, the improvement of the degree of closure of the white water cycle of the paper machine, and the use of other papermaking additives, the accumulation of disturbing anionic impurities in the wet end of the paper machine Concentrations are getting higher and higher, and they are more and ...

Claims

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Application Information

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IPC IPC(8): D21H21/16D21H17/60D21H17/06D21H17/66
Inventor 施晓旦尹东华王养臣
Owner SHANGHAI DONGSHENG NEW MATERIALS
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